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Patented Sept. 2, 1924.

UNITED STATES PATENT OFFICE,

llo Drawing.

To all whom it may concern:

Be it known that I, ROBERT ,W. PRITIIE, a citizen of Canada, residing in Toronto, in the Province of Ontario, Dominion of Gan ada, have invented new and useful Improvements in Vermin Exterminators, of which the following is a specification.

This invention relates to a vermin exterminating compound and more particular 1y to a preparation which is designed to be eaten by rats and cause the death of-the same by oisoning.

It is t e object of this invention to roduce a compound of this character whic is very attractive to rats and cause the same to eat freely thereof; which has, a very rapid poisoning efl'ect on rats but 0 crates as an emetic on dogs, cats and the ike'and also on human bein ifthe same is eaten by the same accidental and which dries out the decayable tissues of the rat and leaves only the non-decaying matter of the same in a mummified form so thatno objectionable odors or se tic conditions occur when a rat is destroyed by this preparation.

This improved vermin exterminator comprises the following ingredients and quantities:

. Parts. Phosphorus 7 Carbon bisulphide a, 6 Water 162 Flour -4--. Glucose 175 Glycerin 64 Tartar emetic 35 Oil of anise 4 Caramel 4 In com ounding these ingredients a paste is forme by mixing 80 parts of flour, 17 5 parts of glucose, and 150 parts of water, then adding thereto 35 parts oftartar emetic, and then boiling this mass until the same is thoroughl heated and the parts efiectively comming ed.

To 6 parts of carbon bisulphide are now added 12 arts of water fol-dissolving the former, t on 7 parts of phosphorus Hare added thereto and then 64 parts of lycerin are added to the mass after which the same is thoroughly mixed.

This mixture of carbon bisulphide, glycerin, hosphorus and water is now stirred into t above described paste made of flour, glucose, water and tartar emetic, and when also an Application filed December 80, 1920. Serial No. 484,171.

the mixture has cooled there are then added to the same 4 parts of oil of anise and 4 parts of caramel which completes the mixture.

Care must be taken to keep the phosphorus and carbon bisulphide away from heat and flame on account of their inflammable character. The tartar emetic is the commonly known mixture of antimon and potassium which, aside fromgiving t e preparation a good consistency for spreading on bread or other bait, also serves as an emetic in case the preparation is eaten accidentally by dogs, cats or human beings, but as rats cannot vomit the same, it operates as a poison on them. The phosphorus in the mixture operates to dry out, mummify, or convert into an antiseptic condition the flesh and bones of the body of the rats, leavin only the skins which produce no odor or isease as is commonly the case with ordinary poisons. The carbon bisulphide operates as a solvent for the phosphorus and later evaporates out of the mixture. The water is added to the carbonbisulphide and phosphorus to revent evaporation and also avoid hazard for the time being while the phosphorus is being handled.

The presence of lycerin in the mixture has the efi'ect of hofillng the phosphorus in solution, also to prevent ox genation of the phosphorus and thus avoi danger of fire at any time from the phosphorus, and it plies a certain amount of sweetening and ot er pro erties which have the effect of attracting t e rats.

The mixture of flour, water and glucose makes a paste of which the rats are very fond and which is of the proper consistency to form a vehicle in which the poisonous ing rlpdients are concealed without detection.

e primary function of the oil of anise is to attract the rats, while caramel, common] known as burnt sugar, also functions as a ure on account of its edibility and as a coloring agent which appeals to the taste of rats.

It has been found in actual practice that rats and similar vermin will eat this comound in preference to the hi her grades of i ood commonly consumed by uman beings, such as fresh eggs and cheese, this being due to the particular ingredients which are very attractive to the taste of rats.

After the rat has eaten of the compound,

it cannot throw the some off, but will die wherever overtaken by the poison, and gradually yield to the curing e eot of the hos-- phorus until the flesh and bones are ried out and nothing is leftbut the pelt without odor or liability of breeding disease.

I claim as my invention:

1. A compound for exterminating vermin including phosphorus, glycerine, tartar emetic, and a vehicle.

2. A compound for exterminating vermin including phosphorus, glycerine, carbon bisulphide, tartar emetic, caramel and :1 vehicle.

ROBERT W. PRITTIE. 

